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All results from a given calculation for SiC (silicon monocarbide)

using model chemistry: PBEPBE/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C*V 3Σ
2 1 yes C*V 1Σ

State 1 (3Σ)

Jump to S2C1
Energy calculated at PBEPBE/3-21G*
 hartrees
Energy at 0K-325.504609
Energy at 298.15K-325.502868
HF Energy-325.504609
Nuclear repulsion energy25.545584
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at PBEPBE/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σ 956 912 7.68      

Unscaled Zero Point Vibrational Energy (zpe) 478.1 cm-1
Scaled (by 0.9535) Zero Point Vibrational Energy (zpe) 455.9 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at PBEPBE/3-21G*
B
0.66297

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/3-21G*

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.522
C2 0.000 0.000 -1.218

Atom - Atom Distances (Å)
  Si1 C2
Si11.7401
C21.7401

picture of silicon monocarbide state 1 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.264      
2 C -0.264      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 1.148 1.148
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.163 0.000 0.000
y 0.000 -20.403 0.000
z 0.000 0.000 -19.870
Traceless
 xyz
x 2.974 0.000 0.000
y 0.000 -1.886 0.000
z 0.000 0.000 -1.088
Polar
3z2-r2-2.175
x2-y23.240
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.290 0.000 0.000
y 0.000 4.740 0.000
z 0.000 0.000 7.247


<r2> (average value of r2) Å2
<r2> 24.675
(<r2>)1/2 4.967

State 2 (1Σ)

Jump to S1C1
Energy calculated at PBEPBE/3-21G*
 hartrees
Energy at 0K-325.471230
Energy at 298.15K-325.469511
HF Energy-325.471230
Nuclear repulsion energy26.805417
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at PBEPBE/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σ 1090 1039 1.67      

Unscaled Zero Point Vibrational Energy (zpe) 544.9 cm-1
Scaled (by 0.9535) Zero Point Vibrational Energy (zpe) 519.6 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at PBEPBE/3-21G*
B
0.72998

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/3-21G*

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.497
C2 0.000 0.000 -1.161

Atom - Atom Distances (Å)
  Si1 C2
Si11.6583
C21.6583

picture of silicon monocarbide state 2 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.230      
2 C -0.230      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 1.769 1.769
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.827 0.000 0.000
y 0.000 -19.827 0.000
z 0.000 0.000 -15.580
Traceless
 xyz
x -2.124 0.000 0.000
y 0.000 -2.124 0.000
z 0.000 0.000 4.247
Polar
3z2-r28.494
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.290 0.000 0.000
y 0.000 4.740 0.000
z 0.000 0.000 7.247


<r2> (average value of r2) Å2
<r2> 23.049
(<r2>)1/2 4.801